diff --git a/.ci/travis/linux/before_script.sh b/.ci/travis/linux/before_script.sh
index 2dd11d21dc8..8c855313e4f 100755
--- a/.ci/travis/linux/before_script.sh
+++ b/.ci/travis/linux/before_script.sh
@@ -18,11 +18,11 @@ set -e
 pushd .docker
 
 docker --version
+docker-compose --version
+docker-compose -f $DOCKER_COMPOSE config
 #docker pull ubuntu:16.04
 docker pull "qgis/qgis3-build-deps:${DOCKER_TAG}" || true
-docker build --file Dockerfile-deps \
-             --cache-from "qgis/qgis3-build-deps:${DOCKER_TAG}"\
-             --tag "qgis/qgis3-build-deps:${DOCKER_TAG}" .
+docker build --cache-from "qgis/qgis3-build-deps:${DOCKER_TAG}" -t "qgis/qgis3-build-deps:${DOCKER_TAG}" .
 # image should be pushed even if QGIS build fails
 # but push is achieved only on branches (not for PRs)
 if [[ $DOCKER_PUSH =~ true ]]; then
diff --git a/.ci/travis/linux/docker-build-test.sh b/.ci/travis/linux/docker-build-test.sh
index 5df55a6e679..ccfbdac7b09 100755
--- a/.ci/travis/linux/docker-build-test.sh
+++ b/.ci/travis/linux/docker-build-test.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -e
+#set -e
 
 # locale-gen en_US.UTF-8
 # export LANG=en_US.UTF-8
@@ -14,7 +14,7 @@ ccache -z
 
 cd /root/QGIS
 
-sleep 20
+#sleep 20
 
 printf "[qgis_test]\nhost=postgres\nport=5432\ndbname=qgis_test\nuser=docker\npassword=docker" > ~/.pg_service.conf
 export PGUSER=docker
@@ -49,9 +49,15 @@ cmake \
 export LD_PRELOAD=/lib/x86_64-linux-gnu/libSegFault.so
 export CTEST_BUILD_COMMAND="/usr/bin/ninja"
 
+ls -la --full-time python/plugins/processing/tests/testdata/expected/polys_centroid.*
+
 ninja
 
-python3 /root/QGIS/.ci/travis/scripts/ctest2travis.py xvfb-run ctest -V -E "$(cat /root/QGIS/.ci/travis/linux/blacklist.txt | sed -r '/^(#.*?)?$/d' | paste -sd '|' -)" -S /root/QGIS/.ci/travis/travis.ctest --output-on-failure
+python3 /root/QGIS/.ci/travis/scripts/ctest2travis.py xvfb-run ctest -V -R ProcessingQgisAlgorithmsTest -S /root/QGIS/.ci/travis/travis.ctest --output-on-failure
+
+find / -iname "*.shp"
+
+#python3 /root/QGIS/.ci/travis/scripts/ctest2travis.py xvfb-run ctest -V -E "$(cat /root/QGIS/.ci/travis/linux/blacklist.txt | sed -r '/^(#.*?)?$/d' | paste -sd '|' -)" -S /root/QGIS/.ci/travis/travis.ctest --output-on-failure
 
 ccache -s
 
diff --git a/.ci/travis/linux/install.sh b/.ci/travis/linux/install.sh
index cc1e80e6114..138a2b3680a 100755
--- a/.ci/travis/linux/install.sh
+++ b/.ci/travis/linux/install.sh
@@ -12,3 +12,6 @@
 #   (at your option) any later version.                                   #
 #                                                                         #
 ###########################################################################
+
+shopt -s expand_aliases
+alias python=python3
diff --git a/.ci/travis/linux/script.sh b/.ci/travis/linux/script.sh
index 251a19d86ca..e976291b078 100755
--- a/.ci/travis/linux/script.sh
+++ b/.ci/travis/linux/script.sh
@@ -21,8 +21,6 @@ docker-compose -f $DOCKER_COMPOSE run --rm qgis-deps
 
 mkdir -p $CCACHE_DIR
 
-docker-compose --version
-docker-compose -f $DOCKER_COMPOSE config
-docker-compose -f $DOCKER_COMPOSE run --rm qgis-build-and-test
+docker-compose -f $DOCKER_COMPOSE run --rm qgis-deps
 
 popd
diff --git a/.docker/Dockerfile-deps b/.docker/Dockerfile
similarity index 93%
rename from .docker/Dockerfile-deps
rename to .docker/Dockerfile
index 173c2a6cc71..99d5d363e1f 100644
--- a/.docker/Dockerfile-deps
+++ b/.docker/Dockerfile
@@ -1,4 +1,3 @@
-
 FROM      ubuntu:16.04
 MAINTAINER Denis Rouzaud <denis.rouzaud@gmail.com>
 
@@ -102,3 +101,10 @@ ENV QT_SELECT=5
 # RUN cmake --version
 # RUN ${CC} --version
 # RUN ${CXX} --version
+
+# RUN locale-gen en_US.UTF-8
+# ENV LANG=en_US.UTF-8
+# ENV LANGUAGE=en_US:en
+# ENV LC_ALL=en_US.UTF-8
+
+CMD /root/QGIS/.ci/travis/linux/docker-build-test.sh
diff --git a/.docker/docker-compose.travis.yml b/.docker/docker-compose.travis.yml
index 691cc8b422f..ea613df9b7f 100644
--- a/.docker/docker-compose.travis.yml
+++ b/.docker/docker-compose.travis.yml
@@ -5,21 +5,15 @@ services:
     environment:
       - ALLOW_IP_RANGE="172.18.0.0/16"
 
-  qgis-build-and-test:
-    build:
-      context: .
-      dockerfile: Dockerfile-build-test
-      args:
-        DOCKER_TAG: ${DOCKER_TAG}
+  qgis-deps:
     tty: true
-    image: qgis/qgis3-run:${DOCKER_TAG}
+    image: qgis/qgis3-build-deps:${DOCKER_TAG}
     volumes:
       - ${TRAVIS_BUILD_DIR}:/root/QGIS
       - $HOME/.ccache:/root/.ccache  # if changed, also change env var
     links:
       - postgres
     environment:
-      - DOCKER_TAG=${DOCKER_TAG}
       - CCACHE_DIR=/root/.ccache
       - CTEST_BUILD_DIR=/root/QGIS
       - TRAVIS_BRANCH=${TRAVIS_BRANCH}
diff --git a/tests/testdata/polys_overlapping_with_id.dbf b/tests/testdata/polys_overlapping_with_id.dbf
index 8c4a03e4823..2cccecb9065 100644
Binary files a/tests/testdata/polys_overlapping_with_id.dbf and b/tests/testdata/polys_overlapping_with_id.dbf differ